Calculating-machine.



` fzlrther away are marked in.r full, the larger fractions such as 8ths, 16ths,4ths and halves.

To theinnercoverlO is pivoted at. 10b or otherwise attached'loosely a' tongue or stop 14, extending between saidA cover and the dial 2 and across the 'annular exposed space between the covers 10, 12. The free outer end of said stop is located between the dial 2 and the outer cover 12. The beveled flanges at the adjacent edges of the covers 10.12 are providedwith cut-outportions 10 12d, adjacent to the Window! 12", said portions allowing the stop 14 (which passes through;

them) to swing to-one side or the other 'to a limited Vextent,th'e shoulders at the ends. of which cut-outportions determining the extreme positions ofthe sto 14.

li-pivoted handle 15 similar to a Watch ring hanger) is' provided' for Athe convenient carrying of the device, which may be made ofthe size of a smallwatch. Through openings 16'1nay be provided at two or morev points for the purpose.of inserting tacks, pins, or other fastening deviceswhen it is desired to secure the instrument to a. draw in(` board in order to avoid the .necessity of holding it in one hand-while Ithe other is used to manipulate the dial. l

T he device is operated by means of a pencil orother convenient instrument inserted in the proper reces` s2".- First the dia-l 2 is' 'turned until. zeros appear in bothx windows 12 and12b, For addition, the dialis turned clockwise, for subtraction, contra-clockwise.

Tf for instance it be desired to add 9/64, the pencil is inserted in the recess 2b-next to that figure 9 of the outer graduation 12c which is in` the circle nearest to the inner edge of the cover12, and is then moved clockwise (to the right.) together with the dial 2, until the pencil is stopped by the wire or tongue 14 coming againstthe shoulders at the right of the cut-out portions 10, 12".. The recess` containing. the` lpencil will thus come exactly in line iiith the windows 12 and 12b. If this movement of the dial is theA first from the zero position, the number 9/64 will appear under the window 12. .If now it is desired to add another number, say 13/32, the pencil will be inserted in the recess V2b which stands opposite that igurel of the outer graduation 12 which is in the second t or fncls) circle, and the dial'will be turned as before untilthe stop 14 arrests the motion. There vill then appearin the window 12b the number 35/64 this being the sum of 9/64 a-nd'13/32. This process may becontinued indefinitely. When the s um hasI reached one will be exactly as for' adding, except that the dial is turned in the tra-clockwise) and the figures 1.0nv on the inner cover 10 are used for locating the pencil, stylus, or tl'ie'like. we 'wish to substract 3/16 from the .two

numbers which we added above, the peacil alinement with the Windows liv". 12b, and in the latter Window there 'will appear the number 2 3/64` which is the result of SUM-1L 1.3/32-3/16. i

It will be noticedthat it is possibi@ to bring-the stylus, when' moving 'the dial, exactly opposite the window 15V-,12% whether: the movement be toward the right or -toward the' left, for the reason that the stop 14 is movable to the right or lett just far enough to clear one of the recesses 2b when the latter is standingexactiy in line with the Windows. I am thus enable-:l to add and subtract While using a single 4set oi' holes or recesses 21 in the dial 2,y and with the numberings on the inner .graduation 1Ga and on the-outer-graduation 12c of the covers 10 land 1 2 respectively ,placed exactly opposite each other, in inverse order.

Various modifications may be made 'ithout' departing from the nature ot my iii-- vention as set forth-in the appended olaiins.

I claim: 1. A calculating device comprising a casingprovided with a Window, an 'annular opening and graduations adjacent tothe edges of said opening, the n'uinberings on the inner graduation being placed exactly opposite those on the outer graduation, but A1n inverse order, a dial mounted to turn concentrically with saidopening and provided'with recesses at intervals correspondying to those of the graduations, said recesses. being i exposed through said opening, the dial being provided with' a graduation adapted to shou7 in thewindowof the casing, and a stop secured to the casing moi`- ably and extending across the annular opening thereof to take operative positions either at the left-or at the -right of the Window?s center line,V

2. A calculating device comprising a casingprovided with Aa window, an annular opening, 'two graduations adjacent 'to the respective edges of said opening, said gradu ations having nuinherings exactly opposite each other, but in inverse order, and stop 'shoulders adjacent to said window, a dial mounted to turn in said casing and provided with a series of recesses exposed through said open1ng,fand also-with a graduation opposite direction (com For example if Bti vadaptedA to shun-'through said Window, and

- a'stop pivoted tot-he casing andextendin across theannular opening'fthereo'ffan ladapted to "engage said stop shoulders.4

3. A calculating device comprising a casing provlded with' a window, spaced anges 'with an annula opening bet-Ween them, 'said oppo'site each other, but .in-inverse order,`

.ya dial mounted t-o turn' in said casing and provided With a series oflrecesses' exposed 'through said opening', and'also with a gradu ation adapted to showj through said -Window, and a stop secured'to the casingloosely to havea limited lateral movement 'inthe cut out .portionsof saidfflanges and extend: lng across the annular openmg'gof the casing,

4f.' Acalc'ulatin'g device comprising a, casi limit` .the movement of thestyls to a defil nit-enero point for both l`addition and subtraction directions"of the stylus movement.

ing provided witht-wo uindows, an lannular opening,vv and graduatlons, adjacent' vto-'said opening, adial mounted to turn 1n said cas,

imgLa-nd Ip'rovidxl .with a series of 4.recesses exposed through said opening, with grad'u-g ations adapted'to show .through oneof said windows, and with.A aslot or depression, a.

'pinion Whose teeth are 'adapted 'to "enter said depression, a numbered lroller heldto rotate with said pinion and adaptedto show for pressing the pinion'towardthe dial.A k5. A calcultingdevijce comprising acasing" having awin'dow, en annular opening,

andvg'raduatinsadjacent tos'aid opening, a'

dial mounted to' turnin'said casing. and

provided with aA series-4 of recesses .exposed through seidopening, a "numbered "roller t carrying 'said ward andfromthedil, and. a springpor pressing 4the shaft-' towhrd thevdi'al.

f6. calculating devicel comprising a sta- 'tionary 'member' orjcasing, anotherV member fada ted to be moved in one direction .for

addition 'andinf the opposite direction for subtraction, by meansfof a stylus or. the like, and a stopfsecured lmovably tothe stationary niemberin'.'the path of said stylus, to

In testimony whereof, l hare signed this da ted'to -show 'through-said window, fa I i) oller 'and adapted -to'- be 'turned periodicaly bysaiddijaly--said shaft being alsoV movable transversely tothrough the other Windowiand-'elastic means 'y specification in the presence of two subscribing witnesses. j REYNOLD JANNEY.

- vTitnessesz l' v l F. B. HU'NGERFORD, 

